There's Money Where Your Mouth Is, a Back Stage Books/Watson-Guptill publication is the ultimate voice-over training book on the market. Along with expert advice and script analysis, there are numerous practice commercials, industrials and multimedia scripts.Many colleges and high schools across the country have adopted it as a textbook for learning voice-over skills. Elaine Clark, the author of There's Money Where Your Mouth Is, teaches a Voice-Overs By The Book class several times a year, to help people fully understand and utilize the information.